HOPKINTON, N.H. (AP) — People who may have been exposed to hepatitis A by a bartender in Hopkinton, N.H., are getting their first opportunity to get vaccinated.

The state public health department is holding the first of two vaccination clinics Friday, from noon to 8 p.m. at Hopkinton High School. The clinic also will be open 9 a.m. to 2 p.m. on Saturday.

Anyone who ate or drank at the American Legion or Covered Bridge Restaurant in the Hopkinton village of Contoocook between July 20 and Aug. 3 is being asked to get vaccinated.

Hepatitis A is a contagious liver disease that can be spread when an infected person handles food without appropriate hand hygiene. Vaccinations given soon after exposure can prevent the illness from developing.

“This is a low-risk exposure, but we want to be able to offer this to people, so we prevent any additional illnesses,” Christine Adamski of the public health department told WMUR-TV on Friday.

Officials estimate that the American Legion and the restaurant had between 600 and 1,000 patrons during the time frame in question. Health officials said most children should already be vaccinated against hepatitis A, and that anyone who has been vaccinated in the past does not need to do so again.